Color conversion panel and display device including the same

ABSTRACT

A color conversion panel includes a substrate. A first color conversion layer, a second color conversion layer, and a transmission layer are provided on the substrate. A first scatterer layer is provided between the first color conversion layer and the second color conversion layer. A second scatterer layer is provided between the second color conversion layer and the transmission layer. A light filter layer is provided between the first scatterer layer and the first color conversion layer, between the first scatterer layer and the second color conversion layer, between the second scatterer layer and the second color conversion layer, and between the second scatterer layer and the transmission layer.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional application of U.S. application Ser.No. 16/715,512, filed on Dec. 16, 2019, which is a continuation of U.S.patent application Ser. No. 15/952,733, filed on Apr. 13, 2018, now U.S.Pat. No. 10,509,253, issued on Dec. 17, 2019, which claims priority toKorean Patent Application No. 10-2017-0116531 filed in the KoreanIntellectual Property Office on Sep. 12, 2017, and the disclosures ofthe above referenced applications are incorporated by reference hereinin their entirety.

TECHNICAL FIELD

Exemplary embodiments of the present invention relate to a colorconversion panel, and more particularly to a display device includingthe same.

DISCUSSION OF RELATED ART

A liquid crystal display used as a display device may include two fieldgenerating electrodes, a liquid crystal layer, a color filter, and apolarizer. The polarizer and the color filter of the liquid crystaldisplay may lose light. A liquid crystal display including a colorconversion layer may reduce a loss of light and increase efficiency of adisplay device.

SUMMARY

A color conversion panel according to an exemplary embodiment of thepresent invention reduces color mixture and increases light outputtingefficiency in a display device including the same.

A color conversion panel according to an exemplary embodiment of thepresent invention includes a substrate. A first color conversion layer,a second color conversion layer, and a transmission layer are providedon the substrate. A first scatterer layer is provided between the firstcolor conversion layer and the second color conversion layer. A secondscatterer layer is provided between the second color conversion layerand the transmission layer. A light filter layer is provided between thefirst scatterer layer and the first color conversion layer, between thefirst scatterer layer and the second color conversion layer, between thesecond scatterer layer and the second color conversion layer, andbetween the second scatterer layer and the transmission layer.

The color conversion panel may include a reflection layer providedbetween at least one of the first or second scatterer layers and atleast one of the first color conversion layer, the second colorconversion layer, or the transmission layer.

The reflection layer may be provided on at least one side of the firstcolor conversion layer, the second color conversion layer, or thetransmission layer. The reflection layer need not be provided on anupper side of the first color conversion layer, the second colorconversion layer, or the transmission layer opposite the substrate.

The color conversion panel may include an inner light filter layerprovided between the reflection layer and at least one of the firstcolor conversion layer, the second color conversion layer, or thetransmission layer.

The color conversion panel may include a blue light cutting filterprovided on the substrate, and overlapping the first color conversionlayer and the second color conversion layer along a direction orthogonalto an upper surface of the substrate.

The scatterer layer may include at least one of TiO₂, ZrO₂, HfO₂, Ta₂O₅,Y₂O₃, or ZnO.

A color conversion panel according to an exemplary embodiment of thepresent invention includes a substrate. A first color conversion layer,a second color conversion layer, and a transmission layer are providedon the substrate. A light filter layer is provided on the first colorconversion layer, the second color conversion layer, and thetransmission layer. An inner scattering layer is provided on at leastone of between the first color conversion layer and the light filterlayer, between the second color conversion layer and the light filterlayer, or between the transmission layer and the light filter layer.

The color conversion panel may include an inner light filter layerprovided on the inner scattering layer.

The color conversion panel may include a reflection layer provided onthe inner scattering layer.

The color conversion panel may include a first scatterer layer providedbetween the first color conversion layer and the second color conversionlayer, and a second scatterer layer provided between the second colorconversion layer and the transmission layer.

The inner scattering layer may include at least one of TiO₂, ZrO₂, HfO₂,Ta₂O₅, Y₂O₃, or ZnO.

A color conversion panel according to an exemplary embodiment of thepresent invention includes a substrate. A first color conversion layer,a second color conversion layer, and a transmission layer are providedon the substrate. A first scatterer layer is provided between the firstcolor conversion layer and the second color conversion layer. A secondscatterer layer is provided between the second color conversion layerand the transmission layer.

The color conversion panel may include a light filter layer. The lightfilter layer may include a horizontal unit and a vertical unit. Thehorizontal unit may be in direct contact with the first color conversionlayer, the second color conversion layer, and the transmission layer.The vertical unit may be provided between the first color conversionlayer and the second color conversion layer, and between the secondcolor conversion layer and the transmission layer. Opposite sides of thevertical unit may be in direct contact with one of the first scattererlayer or the second scatterer layer.

According to an exemplary embodiment of the present invention, a displaydevice includes a display panel, and a color conversion panel providedon the display panel. The color conversion panel includes a substrate. Afirst color conversion layer, a second color conversion layer, and atransmission layer are provided on the substrate. A first scattererlayer is provided between the first color conversion layer and thesecond color conversion layer, and a second scatterer layer is providedbetween the second color conversion layer and the transmission layer. Alight filter layer is provided between the first scatterer layer and thefirst color conversion layer, between the first scatterer layer and thesecond color conversion layer, between the second scatterer layer andthe second color conversion layer, and between the second scattererlayer and the transmission layer.

The display device may include a reflection layer provided between atleast one of the first or second scatterer layers and at least one ofthe first color conversion layer, the second color conversion layer, orthe transmission layer.

The reflection layer may be provided on at least one side of the firstcolor conversion layer, the second color conversion layer, or thetransmission layer. The reflection layer need not be provided on anupper side of the at least one of the first color conversion layer, thesecond color conversion layer, or the transmission layer opposite thesubstrate.

The display device may include an inner light filter layer providedbetween the reflection layer and the first color conversion layer,between the reflection layer and the second color conversion layer, orbetween the reflection layer and the transmission layer.

The display device may include an inner scattering layer providedbetween the first color conversion layer and the light filter layer,between the second color conversion layer and the light filter layer, orbetween the transmission layer and the light filter layer.

According to an exemplary embodiment of the present invention, the colorconversion panel may include the substrate. The first color conversionlayer, the second color conversion layer, and the transmission layer maybe positioned above the substrate. Each of the first color conversionlayer, the second color conversion layer, and the transmission layer mayhave angled sidewalls with respect an upper surface of the substrate.The blue light cutting filter may be disposed on the substrate betweenthe first color conversion layer and the substrate, and between thesecond color conversion layer and the substrate. The light filter layermay be disposed on the angled sidewalls of each of the first colorconversion layer, the second color conversion layer, and thetransmission layer. The first scatterer layer may be positioned betweenthe first color conversion layer and the second color conversion layer.The second scatterer layer may be positioned between the second colorconversion layer and the transmission layer.

According to an exemplary embodiment of the present invention, themixture of colors of the color conversion panel is recued or prevented,thus increasing display quality and increasing light outputtingefficiency of a display device.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features of the present invention will become moreapparent by describing in detail exemplary embodiments thereof withreference to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 3 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 4 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 6 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 8 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 9 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

FIG. 10 and FIG. 11 illustrate a principle of light scattering in ascatterer and preventing a mixture of colors according to an exemplaryembodiment of the present invention.

FIG. 12 to FIG. 14 illustrate exemplary changes of luminance of aneighboring pixel when there is no scatterer and when there is ascatterer.

FIG. 15 is a cross-sectional view of a display device including a colorconversion panel according to an exemplary embodiment of the presentinvention.

FIG. 16 is a layout view of a display device according to an exemplaryembodiment of the present invention.

FIG. 17 is a cross-sectional view taken along a line XV-XV of FIG. 16 .

DETAILED DESCRIPTION OF THE EMBODIMENTS

Exemplary embodiments of the present invention will be described belowin more detail with reference to the accompanying drawings. In thisregard, the exemplary embodiments may have different forms and shouldnot be construed as being limited to the exemplary embodiments of thepresent invention described herein.

Like reference numerals may refer to like elements throughout thespecification and drawings.

Sizes of elements in the drawings may be exaggerated for clarity ofdescription.

It will be understood that when a component, such as a layer, a film, aregion, or a plate, is referred to as being “on” another component, thecomponent may be directly on the other component or interveningcomponents may be present.

The phrases “on a plane” or “a plan view” mean viewing the objectportion from the top, and the phrases “on a cross-section” or “across-sectional view” mean viewing a cross-section of which the objectportion is vertically cut and illustrated from the side.

A color conversion panel according to an exemplary embodiment of thepresent invention will be described in more detail below with referenceto FIG. 1 .

FIG. 1 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

Referring to FIG. 1 , a color conversion panel 300 may include asubstrate 310, a first color conversion layer 330R, a second colorconversion layer 330G, a transmission layer 330B, and a scatterer layer340. The first color conversion layer 330R, the second color conversionlayer 330G, and the transmission layer 330B may be arranged on thesubstrate. For example, the first color conversion layer 330R, thesecond color conversion layer 330G, and the transmission layer 330B maybe arranged on the substrate 310 along a direction parallel to an uppersurface of the substrate 310. However, the order of arrangement of thefirst color conversion layer 330R, the second color conversion layer330G, and the transmission layer 330B is not limited to a particularorder.

The scatterer layer 340 may be provided between the first colorconversion layer 330R and the second color conversion layer 330G, andbetween the second color conversion layer 330G and the transmissionlayer 330B. Thus, at least one scatterer layer 340 (e.g., two scattererlayers 340) may be provided between the transmission layer 330B and thefirst color conversion layer 330R. The scatterer layers 340 may separatethe first color conversion layer 330R, the second color conversion layer330G, and the transmission layer 330B from each other along thedirection parallel to the upper surface of the substrate 310. The colorconversion layers 330R and 330G of the color conversion panel 300 mayconvert incident blue light into red light or green light, respectively,and the transmission layer 330B transmits incident blue light.

The scatterer layer 340 may include a scatterer, and it may include atleast one of zirconium oxide (ZrO₂), hafnium oxide (HfO₂), tantalumoxide (Ta₂O₅), titanium oxide (TiO₂), yttrium oxide (Y₂O₃), or zincoxide (ZnO).

The scatterer layer 340 may scatter light emitted by the first colorconversion layer 330R, the second color conversion layer 330G, or thetransmission layer 330B to prevent the light from being transmitted to aneighboring color conversion layer or a transmission layer. As anexample, part of light emitted by the color conversion layer may betransmitted to a side of the color conversion layer (e.g., toward aneighboring color conversion layer, which may emit a different colorlight), and thus light transmitted to a side of the color conversionlayer may be transmitted to a neighboring color conversion layer and maycause a mixture of colors and may reduce light outputting efficiency.However, the scatterer layer 340 scatters the light that proceeds in astraight line (e.g., a straight line towards a neighboring colorconversion layer) in various directions, and thus the scatterer layer340 may reduce or prevent light from being transmitted to a neighboringcolor conversion layer or a transmission layer. Thus, the mixture ofcolors by the first color conversion layer 330R, the second colorconversion layer 330G, and the transmission layer 330B respectivelyemitting different colors may be reduced or eliminated. The scattererlayer 340 will be described in more detail below.

Referring to FIG. 1 , a light blocking layer 320 may be provided betweenthe scatterer layer 340 and the substrate 310. As an example, the lightblocking layer 320 may be in direct contact with the substrate 310.However, exemplary embodiments of the present invention are not limitedthereto. For example, the light blocking layer 320 need not contact thesubstrate 310 and it may be provided between the first color conversionlayer 330R and the second color conversion layer 330G, between thesecond color conversion layer 330G and the transmission layer 330B,while being spaced apart from the substrate. Thus, at least one lightblocking layer 320 (e.g., two light blocking layers 320) may bepositioned between the transmission layer 330B and the first colorconversion layer 330R, while being spaced apart from the substrate.

In an exemplary embodiment of the present invention, the first colorconversion layer 330R may convert supplied blue light into red light.The first color conversion layer 330R may include a red phosphor, andthe red phosphor may be at least one material of (Ca, Sr, Ba)S, (Ca, Sr,Ba)₂Si₅N₈, (CaAlSiN₃), CaMoO₄, or Eu₂Si₅N₈. Further, the first colorconversion layer 330R may include a quantum dot. The quantum dot mayconvert incident blue light into red light.

The second color conversion layer 330G may convert the supplied bluelight into green light. The second color conversion layer 330G mayinclude a green phosphor, and the green phosphor may be at least onematerial of yttrium aluminum garnet (YAG), (Ca, Sr, Ba)₂SiO₄, SrGa₂S₄,BAM, α-SiAlON, β-SiAlON, Ca₃Sc₂Si₃O₁₂, Tb₃Al₅O₁₂, BaSiO₄, CaAlSiON, or(Sr_(1-x)Ba_(x))Si₂O₂N₂. Here, the x may be a number between 0 and 1.Further, the second color conversion layer 330G may include a quantumdot. The quantum dot may convert incident blue light into green light.

The transmission layer 330B transmits the incident blue light. Thetransmission layer may include a transparent polymer, and the suppliedblue light may be transmitted therethrough to display the blue color.The transmission layer 330B corresponding to a region for outputtingblue light includes a material for outputting the incident blue lightwithout an additional phosphor or quantum dot, and it may include ascatterer.

A blue light cutting filter 322 may be provided between the first colorconversion layer 330R and the substrate 310 and between the second colorconversion layer 330G and the substrate 310. Referring to FIG. 1 , theblue light cutting filter 322 may be a single layer overlapping thefirst color conversion layer 330R and the second color conversion layer330G (e.g., along a direction orthogonal to an upper surface of thesubstrate 310). The blue light cutting filter 322 may be a single layeroverlapping the first color conversion layer 330R and the second colorconversion layer 330G, respectively (e.g., along the directionorthogonal to the upper surface of the substrate 310).

The blue light cutting filter 322 may be a mixture of one of BiO₂, ZnO,or Ce₂O₃ and one of CaCO₃, ZrO₂, TiO, or Ar₂O₃; however, exemplaryembodiments of the present invention are not limited thereto. Forexample, the blue light cutting filter 322 may include another materialfor blocking blue light.

The blue light cutting filter 322 absorbs light in a wavelength band offrom about 400 nm to about 500 nm, and thus the blue light with thiswavelength band is blocked. Thus, transmittance of the blue lightcutting filter 322 is equal to or less than about 5% in the wavelengthof 450 nm, it is equal to or greater than about 80% in the wavelength of535 nm, and it is equal to or greater than about 90% in the wavelengthof 650 nm.

Thus, the blue light cutting filter 322 prevents mixture of colors whenthe blue light passes through the first color conversion layer 330R andthe second color conversion layer 330G to realize the red color (R) andthe green color (G).

Referring to FIG. 1 , the color conversion panel 300 may include a lightfilter layer 360 provided on the first color conversion layer 330R, thesecond color conversion layer 330G, and the transmission layer 330B. Thelight filter layer 360 may have a structure in which a layer with a lowrefractive index and a layer with a high refractive index are stacked.The light filter layer 360 may efficiently supply incident light, and itmay be omitted depending on an exemplary embodiment of the presentinvention.

The color conversion panel 300 may include a planarization layer 390provided on the scatterer layer 340 and the light filter layer 360. Theplanarization layer 390 may eliminate a manufacturing step caused bydifferent heights of the scatterer layer 340, the first color conversionlayer 330R, the second color conversion layer 330G, and the transmissionlayer 330B, while providing a planar surface on an upper surface of theplanarization layer 390. The planarization layer 390 may be omitteddepending on an exemplary embodiment of the present invention.

According to another exemplary embodiment of the present invention, thecolor conversion panel 300 may include the substrate 310. The firstcolor conversion layer 330R, the second color conversion layer 330G, andthe transmission layer 330B may be positioned above the substrate 310.Each of the first color conversion layer 330R, the second colorconversion layer 330G, and the transmission layer 330B may have angledsidewalls with respect an upper surface of the substrate 310. The bluelight cutting filter 322 may be disposed on the substrate 310 betweenthe first color conversion layer 330R and the substrate 310, and betweenthe second color conversion layer 330G and the substrate 310. The lightfilter layer 360 may be disposed on the angled sidewalls of each of thefirst color conversion layer 330R, the second color conversion layer330G, and the transmission layer 330B. The first scatterer layer 340 maybe positioned between the first color conversion layer 330R and thesecond color conversion layer 330G. The second scatterer layer 340 maybe positioned between the second color conversion layer 330G and thetransmission layer 330B.

A color conversion panel according to an exemplary embodiment of thepresent invention will now be described with reference to FIG. 2 .

FIG. 2 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel described with reference to FIG. 2 is similarto the color conversion panel described with reference to FIG. 1 . Thus,descriptions of constituent elements that are the same or substantiallysimilar to those described above with reference to FIG. 1 , may beomitted below.

Referring to FIG. 2 , the color conversion panel 300 may include areflection layer 350 provided between the scatterer layer 340 and atleast one of the first color conversion layer 330R, the second colorconversion layer 330G, or the transmission layer 330B. The reflectionlayer 350 may include a reflecting metal, and may reflect light outputin the direction of the reflection layer 350 in the directions of thecolor conversion layers 330R and 330G and the transmission layer 330B toincrease an amount of light output to a user.

A part of the light passing through the reflection layer 350 withoutbeing reflected from the reflection layer 350 may be scattered by ascatterer on the scatterer layer 340, and thus the light might not bedirected into the color conversion layer or the transmission layer.Further, when part of the scattered light proceeds in the direction ofthe neighboring color conversion layer or the transmission layer, it isreflected at the reflection layer 350 provided on the neighboring colorconversion layer or the transmission layer and does not enter theneighboring color conversion layer or the transmission layer.

The reflection layer 350 may be provided on the first color conversionlayer 330R, the second color conversion layer 330G, and the transmissionlayer 330B. Alternatively, the reflection layer 350 may be provided onless than all of the first color conversion layer 330R, the second colorconversion layer 330G, and the transmission layer 330B. For example, thereflection layer 350 may be provided only on the transmission layer330B. The transmission layer 330B allows the incident blue light totransmit through, so the blue light may pass again through thetransmission layer 330B compared to the first color conversion layer330R or the second color conversion layer 330G for converting blue lightinto light of a different wavelength and outputting the resultant light.Thus, when the reflection layer 350 is provided on the transmissionlayer 330B, the amount of the output blue light may be increased.

Thus, the reflection layer 350 may be in direct contact with at leastone side from among the sides of the first color conversion layer 330R,the second color conversion layer 330G, or the transmission layer 330B,and it need not be in direct contact with an upper side of the firstcolor conversion layer 330R, the second color conversion layer 330G, orthe transmission layer 330B opposite the substrate 310. If thereflection layer 350 is in direct contact with a substantial portion ofthe upper side of the first color conversion layer 330R, the secondcolor conversion layer 330G, or the transmission layer 330B, it mayreflect the incident blue light so that the blue light is not input intothe color conversion layer or the transmission layer.

A color conversion panel according to an exemplary embodiment of thepresent invention will be described in more detail below with referenceto FIG. 3 .

FIG. 3 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel according to an exemplary embodiment of thepresent invention described with reference to FIG. 3 is similar to thecolor conversion panel described with reference to FIG. 2 . Thus,descriptions of constituent elements that are the same or substantiallysimilar to those described above with reference to FIG. 2 may be omittedbelow.

Referring to FIG. 3 , the color conversion panel 300 according to anexemplary embodiment of the present invention may include an inner lightfilter layer 361 provided between the reflection layer 350 and the firstcolor conversion layer 330R, between the reflection layer 350 and thesecond color conversion layer 330G, and/or between the reflection layer350 and the transmission layer 330B.

The inner light filter layer 361 may include a same material as that ofthe light filter layer 360. For example, the inner light filter layer361 may have a structure in which a layer with a low refractive indexand a layer with a high refractive index are stacked. The inner lightfilter layer 361 may supply incident light relatively efficiently in alike manner to the light filter layer 360, and it may induce totalreflection of light on an interface of the inner light filter layer 361to increase the amount of output light.

A color conversion panel according to an exemplary embodiment of thepresent invention will be described in more detail below with referenceto FIG. 4 .

FIG. 4 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel 300 described with reference to FIG. 4 issimilar to the color conversion panel according to an exemplaryembodiment of the present invention described with reference to FIG. 1except that an inner scattering layer 341 is provided instead of thescatterer layer 340. Thus, descriptions of constituent elements that arethe same or substantially similar to those described above withreference to FIG. 1 may be omitted below.

Referring to FIG. 4 , the color conversion panel 300 according to anexemplary embodiment of the present invention may include the innerscattering layer 341 in direct contact with at least one side of thefirst color conversion layer 330R, the second color conversion layer330G, or the transmission layer 330B. The color conversion panel 300described with reference to FIG. 4 might not include a scatterer layer.

As an example, the inner scattering layer 341 may be provided in atleast one of between the light filter layer 360 and the first colorconversion layer 330R, between the light filter layer 360 and the secondcolor conversion layer 330G, or between the light filter layer 360 andthe transmission layer 330B.

The inner scattering layer 341 may have a film form including ascatterer. The inner scattering layer 341 may include at least one ofzirconium oxide (ZrO₂), hafnium oxide (HfO₂), tantalum oxide (Ta₂O₅),titanium oxide (TiO₂), yttrium oxide (Y₂O₃), or zinc oxide (ZnO).

Similar to the scatterer layer 340 according to an exemplary embodimentof the present invention described with reference to FIG. 1 , the innerscattering layer 341 scatters the light emitted by the first colorconversion layer 330R, the second color conversion layer 330G, or thetransmission layer 330B, which may prevent the light from being input toa neighboring color conversion layer or a transmission layer. Therefore,mixture of colors among the first color conversion layer 330R, thesecond color conversion layer 330G, and the transmission layer 330B forconverting/transmitting different colors may be prevented. However,according to an exemplary embodiment of the present invention, the innerscattering layer 341 is provided between the light filter layer 360 andthe first color conversion layer 330R, between the light filter layer360 and the second color conversion layer 330G, or between the lightfilter layer 360 and the transmission layer 330B, and thus the lightscattered by the inner scattering layer 341 is filtered by the lightfilter layer 360 and the mixture of colors may be reduced or prevented.In addition, the efficiency of output light may be increased.

A color conversion panel according to an exemplary embodiment of thepresent invention will be described in more detail below with referenceto FIG. 5 .

FIG. 5 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel 300 described with reference to FIG. 5 issimilar to the color conversion panel described with reference to FIG. 4except that the color conversion panel 300 described with reference toFIG. 5 includes an inner light filter layer 361. Thus, descriptions ofconstituent elements that are the same or substantially similar to thosedescribed above with reference to FIG. 4 may be omitted below.

Referring to FIG. 5 , the inner light filter layer 361 may be providedbetween the inner scattering layer 341 and the light filter layer 360.The inner light filter layer 361 may totally reflect the light scatteredby the inner scattering layer 341 to an inside of the first colorconversion layer 330R, the second color conversion layer 330G or thetransmission layer 330B. Therefore, the efficiency of the output lightmay be increased and purity of the output light may be increased.

A color conversion panel according to an exemplary embodiment of thepresent invention will be described in more detail below with referenceto FIG. 6 .

FIG. 6 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel 300 described with reference to FIG. 6 issimilar to the color conversion panel described with reference to FIG. 5except that the color conversion panel 300 described with reference toFIG. 6 includes the reflection layer 350 instead of the inner lightfilter layer 361. Thus, descriptions of constituent elements that arethe same or substantially similar to those described above withreference to FIG. 5 may be omitted below.

Referring to FIG. 6 , the reflection layer 350 may be provided betweenthe inner scattering layer 341 and the light filter layer 360.Therefore, the light scattered by the inner scattering layer 341 may bereflected by the reflection layer 350. Thus, the light color-convertedby the color conversion layer or transmitted by the transmission layermay be prevented from being input to the neighboring color conversionlayer or the transmission layer, and the light may be reflected to thecolor conversion layer or the transmission layer direction, thusincreasing the amount of light output to the user.

A color conversion panel according to an exemplary embodiment of thepresent invention will be described in more detail below with referenceto FIG. 7 .

FIG. 7 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel 300 according to an exemplary embodiment ofthe present invention described with reference to FIG. 7 is similar tothe color conversion panel described with reference to FIG. 4 exceptthat the color conversion panel 300 described with reference to FIG. 7includes the scatterer layer 340 provided between the first colorconversion layer 330R and the second color conversion layer 330G,between the second color conversion layer 330G and the transmissionlayer 330B, and between the transmission layer 330B and the first colorconversion layer 330R. Thus, descriptions of constituent elements thatare the same or substantially similar to those described above withreference to FIG. 4 may be omitted below.

Referring to FIG. 7 , the color conversion panel 300 according to anexemplary embodiment of the present invention may include the scattererlayer 340 and the inner scattering layer 341. For example, the scattererlayer 340 may be provided between the first color conversion layer 330Rand the second color conversion layer 330G, between the second colorconversion layer 330G and the transmission layer 330B. Thus, at leastone scatterer layer 340 (e.g., two scatterer layers) may be positionedbetween the transmission layer 330B and the first color conversion layer330R. The inner scattering layer 341 may be provided between the firstcolor conversion layer 330R and the light filter layer 360, between thesecond color conversion layer 330G and the light filter layer 360, andbetween the transmission layer 330B and the light filter layer 360.

Therefore, the light color-converted by one color conversion layer orinput to one transmission layer may be scattered by the inner scatteringlayer 341 provided near the color conversion layers 330R and 330G or thetransmission layer 330B, and might not be transmitted to neighboringcolor conversion layers 330R and 330G or the transmission layer 330B.Further, light directed toward the neighboring color conversion layers330R and 330G or the transmission layer 330B may be scattered by thescatterer layer 340 provided among the first color conversion layer330R, the second color conversion layer 330G, or the transmission layer330B, thus reducing or preventing a mixture of colors.

The color conversion panel 300 according to an exemplary embodiment ofthe present invention will be described in more detail below withreference to FIG. 8 .

FIG. 8 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel 300 described with reference to FIG. 8 issimilar to the color conversion panel described with reference to FIG. 1except that it might not include the light filter layer 360. Thus,descriptions of constituent elements that are the same or substantiallysimilar to those described above with reference to FIG. 1 may be omittedbelow.

Referring to FIG. 8 , the color conversion panel 300 according to anexemplary embodiment of the present invention might not include thelight filter layer 360, and thus the scatterer layer 340 may be providedbetween the first color conversion layer 330R and the second colorconversion layer 330G, between the second color conversion layer 330Gand the transmission layer 330B, and between the transmission layer 330Band the first color conversion layer 330R. Scatterer layers 340 may bein direct contact with the color conversion layers 330R and 330G and thetransmission layer 330B. The light filter layer 360 may be omitted, Thussimplifying a structure and reducing manufacturing costs of the colorconversion panel 300 according to an exemplary embodiment of the presentinvention.

A color conversion panel according to an exemplary embodiment of thepresent invention will be described in more detail below with referenceto FIG. 9 .

FIG. 9 is a cross-sectional view of a color conversion panel accordingto an exemplary embodiment of the present invention.

The color conversion panel 300 described with reference to FIG. 9 issimilar to the color conversion panel described with reference to FIG. 1except for the form of the light filter layer 360. Thus, descriptions ofconstituent elements that are the same or substantially similar to thosedescribed above with reference to FIG. 1 may be omitted below.

Referring to FIG. 9 , regarding the color conversion panel 300 accordingto an exemplary embodiment of the present invention, the light filterlayer 360 may be provided between the scatterer layers 340. As anexample, the light filter layer 360 may include a horizontal unit 363 indirect contact with the color conversion layers 330R and 330G or thetransmission layer 330B, and a vertical unit 362 extending in a verticaldirection with respect to the substrate from the horizontal unit 363.Therefore, the vertical unit 362 might not be in direct contact with thecolor conversion layers 330R and 330G or the transmission layer 330B,but may be in direct contact with the scatterer layer 340. For example,the scatterer layer 340 and the vertical unit 362 of the light filterlayer 360 may be provided between the first color conversion layer 330Rand the second color conversion layer 330G, between the second colorconversion layer 330G and the transmission layer 330B, and between thetransmission layer 330B and the first color conversion layer 330R. Thus,the mixture of colors among the neighboring color conversion layers 330Rand 330G and the transmission layer 330B may be reduced or prevented.

FIG. 10 and FIG. 11 illustrate a principle of light scattering in ascatterer and preventing a mixture of colors according to an exemplaryembodiment of the present invention. FIG. 10 shows progress of lightwhen there is no scatterer, and FIG. 11 shows progress of light whenthere is a scatterer.

Referring to FIG. 10 , when there is no scatterer, the lightcolor-converted by the first color conversion layer 330R may travelalong a straight line path in a direction of the second color conversionlayer 330G. As light has a feature of linearity, part of light output invarious directions by the first color conversion layer 330R may bedirected along a straight line path to the second color conversion layer330G.

However, referring to FIG. 11 , the scatterer provided between the firstcolor conversion layer 330R and the second color conversion layer 330Gscatters the light traveling along the straight line path to the secondcolor conversion layer 330G from the first color conversion layer 330R.For example, the light going straight bumps into the scatterer so it isscattered in various directions, and thus the amount of light reachingthe second color conversion layer 330G is reduced.

Therefore, the color conversion panel including a scatterer layer or aninner scattering layer according to an exemplary embodiment of thepresent invention may prevent the mixture of colors between theneighboring color conversion layers or transmission layers.

The scatterer layer (e.g., scatterer layer 340) according to anexemplary embodiment of the present invention will be described in moredetail below with reference to FIG. 12 to FIG. 14 .

FIG. 12 to FIG. 14 illustrate exemplary changes of luminance of aneighboring pixel when there is no scatterer and when there is ascatterer.

Referring to FIG. 12 , a scatterer is not included between pixels in thehorizontal direction (1), and the scatterer is included between pixelsin the vertical direction (2). A voltage may be applied to markedpixels, luminance may be measured, and exemplary values are illustratedin FIG. 13 and FIG. 14 .

FIG. 13 illustrates exemplary luminance of pixels neighboring each otherin the horizontal direction. Referring to FIG. 13 , a luminanceindicated with a rectangular region of FIG. 13 is a neighboring pixel towhich no voltage is applied, and FIG. 13 illustrates a luminance in therectangular region. Thus, FIG. 13 illustrates that light generated bythe pixel to which the voltage is applied is input to the neighboringpixel. For example, in the case of FIG. 13 , the scatterer is notincluded between the pixels, so luminance is observed from the pixel towhich no voltage is applied, which causes a mixture of colors.

FIG. 14 illustrates exemplary luminance of pixels neighboring each otherin the vertical direction. Referring to FIG. 12 , a scatterer isprovided between the pixels neighboring each other in the verticaldirection. The luminance indicated with a rectangular region of FIG. 14is the neighboring pixel to which no voltage is applied, and FIG. 14illustrates that no luminance is observed. Thus, the scatterer providedbetween the pixels prevents light from being input by the neighboringpixel.

According to an exemplary embodiment of the present invention, the colorconversion panel including the scatterer layer may be provided betweenthe neighboring first color conversion layer 330R and the second colorconversion layer 330G, between the second color conversion layer 330Gand the transmission layer 330B, and between the transmission layer 330Band the first color conversion layer 330R. The inner scattering layer341 may be provided on at least one side between the first colorconversion layer 330R and the light filter layer 360, between the secondcolor conversion layer 330G and the light filter layer 360, and betweenthe transmission layer 330B and the light filter layer 360. Thus, themixture of colors between the neighboring color conversion layers or thetransmission layers may be prevented. Additionally, a reflection layeror a light filter layer according to an exemplary embodiment of thepresent invention may increase light outputting efficiency.

A display device including the color conversion panel according to anexemplary embodiment of the present invention will be described in moredetail below. However, exemplary embodiments of the present inventionarea not limited to the structures described below. Thus, the colorconversion panel according to an exemplary embodiment of the presentinvention is applicable to display devices with various structures.

FIG. 15 is a cross-sectional view of a display device including a colorconversion panel according to an exemplary embodiment of the presentinvention.

Referring to FIG. 15 , the display device may include a display panel400 and the color conversion panel 300. The display panel 400 mayinclude a first display panel 100, a second display panel 200overlapping the first display panel 100 (e.g., along a directionorthogonal to an upper surface of the first display panel 100), and aliquid crystal layer 3 provided between the first display panel 100 andthe second display panel 200 and including liquid crystal molecules 31.However, exemplary embodiments of the present invention are not limitedthereto, and the display panel 400 may include one substrate. As anexample, the display panel 400 may be an emissive display deviceincluding no liquid crystal.

The color conversion panel 300 may be one of the color conversion panels300 described in more detail above with reference to FIG. 1 to FIG. 9 .As an example, FIG. 15 illustrates a color conversion panel 300 asdescribed above with reference to FIG. 1 , but exemplary embodiments ofthe present invention are not limited thereto.

A display device including a color conversion panel according to anexemplary embodiment of the present invention will be described in moredetail below with reference to FIGS. 16 and 17 .

FIG. 16 is a layout view of a display device according to an exemplaryembodiment of the present invention. FIG. 17 is a cross-sectional viewtaken along a line XV-XV of FIG. 16 .

Referring to FIG. 16 and FIG. 17 , the display device may include thedisplay panel 400 and the color conversion panel 300. The display devicemay further includes a light unit 700 providing light to the displaypanel 400 and the color conversion panel 300. The light unit 700 mayemit blue light, and may include a blue light emitting diode (LED).Light output by the light unit 700 may sequentially transmit through thedisplay panel 400 and the color conversion panel 300 and the light maythen be output from the display device.

The display panel 400 may include the first display panel 100, thesecond display panel 200 overlapping the first display panel 100 (e.g.,along a direction orthogonal to an upper surface of the first displaypanel 100), and the liquid crystal layer 3 provided between the firstdisplay panel 100 and the second display panel 200.

The first display panel 100 will be described in more detail below. Agate conductor including a gate line 121 and a gate electrode 124 may beprovided on one side of a first substrate 110 including transparentglass or plastic, and a first polarization layer 12 may be provided onanother side of the first substrate 110.

The gate line 121 may extend in a first direction. The gate conductormay include at least one metal or at least one conductor. The gateconductor may have a multilayered structure.

A gate insulating layer 140 may be provided between the gate conductorand the liquid crystal layer 3. The gate insulating layer 140 mayinclude an inorganic insulating material.

A semiconductor layer 154 may be provided on one side of the gateinsulating layer 140.

A data line 171 may be provided between the semiconductor layer 154 andthe liquid crystal layer 3, and may extend in a second direction totraverse the gate line 121. A source electrode 173 may extend from thedata line 171 and may overlap the gate electrode 124. A drain electrode175 may be separated from the data line 171 (see, e.g., FIG. 16 ), andmay have a bar shape extending toward a center of the source electrode173.

Part of the semiconductor layer 154 need not overlap the data line 171and the drain electrode 175 in a region provided between the sourceelectrode 173 and the drain electrode 175. The semiconductor layer 154may have substantially the same planar form as the data line 171 and thedrain electrode 175 except for a non-overlapping portion.

One gate electrode 124, one source electrode 173, and one drainelectrode 175 may be included in one thin film transistor together withthe semiconductor layer 154, and a channel of the thin film transistorrepresents a region of the semiconductor layer 154 between the sourceelectrode 173 and the drain electrode 175.

A passivation layer 180 may be provided among the source electrode 173,the drain electrode 175, and the liquid crystal layer 3

The passivation layer 180 may include an inorganic insulating materialsuch as a silicon nitride or a silicon oxide, an organic insulatingmaterial, or a low dielectric insulating material.

The passivation layer 180 may include a contact hole 185 overlappingpart of the drain electrode 175.

A first electrode 191 may be provided between the passivation layer 180and the liquid crystal layer 3. The first electrode 191 may bephysically and electrically connected to the drain electrode 175 throughthe contact hole 185, and may receive a data voltage from the drainelectrode 175. The first electrode 191 may be a pixel electrode.

A first alignment layer 11 may be provided between the first electrode191 and the liquid crystal layer 3.

The second display panel 200 may include a second substrate 210, a lightblocking member 220, a second electrode 270, a second alignment layer21, and a second polarization layer 22.

The second polarization layer 22 may be provided on one side of thesecond substrate 210, and the second electrode 270 may be provided onanother side thereof. The second electrode 270 may be a commonelectrode.

The second polarization layer 22 may include a plurality of fine linesarranged at regular intervals, and the fine lines may include a metal.However, without being limited thereto, the second polarization layer 22may have other forms such as a coating-type polarization layer.

The light blocking member 220 may be provided between the secondsubstrate 210 and the second electrode 270. The light blocking member220 may overlap the data line 171 and may extend in the seconddirection. The light blocking member may further include a horizontalunit overlapping the gate line 121 and extending in the first direction.

The second alignment layer 21 may be provided between the secondelectrode 270 and the liquid crystal layer 3.

The color conversion panel 300 is described in more detail below. Thecolor conversion panel 300 may include the substrate 310, the firstcolor conversion layer 330R, the second color conversion layer 330G, thetransmission layer 330B, and the scatterer layer 340. Descriptions ofconstituent elements that are the same or substantially similar to thosedescribed above may be omitted below. As an example, the colorconversion panel 300 may have a configuration according to an exemplaryembodiment of the present invention, as described in more detail abovewith reference to FIG. 1 to FIG. 9 .

The display device according to an exemplary embodiment of the presentinvention may include a color conversion panel, and the color conversionpanel may include the scatterer layer 340 provided between theneighboring color conversion layers or the transmission layers, or theinner scattering layer 341 provided on the side of the color conversionlayer or the transmission layer, thus preventing the mixture of colorsbetween the neighboring color conversion layers or the transmissionlayers. The display device according to an exemplary embodiment of thepresent invention may include a reflection layer or a light filterlayer, thus increasing the light outputting efficiency.

While the present invention has been shown and described with referenceto the exemplary embodiments thereof, it will be apparent to those ofordinary skill in the art that various changes in form and detail may bemade thereto without departing from the spirit and scope of the presentinvention.

What is claimed is:
 1. A color conversion panel comprising: a substrate;a first color conversion layer and a second color conversion layer, onthe substrate; a planarization layer provided between the first colorconversion layer and the second color conversion layer, a light blockingmember disposed on the substrate; and a blue light cutting filterdisposed on the substrate, and overlapping the first color conversionlayer and the second color conversion layer along a direction orthogonalto an upper surface of the substrate, wherein a part of the blue lightcutting filter is overlapped by the light blocking member along adirection orthogonal to an upper surface of the substrate.
 2. The colorconversion panel of claim 1, further comprising a reflection layerprovided between the planarization layer and at least one of the firstcolor conversion layer and the second color conversion layer.
 3. Thecolor conversion panel of claim 2, wherein the reflection layer isprovided on at least one side of the first color conversion layer or thesecond color conversion layer, and wherein the reflection layer is notprovided on an upper side of the first color conversion layer or thesecond color conversion layer opposite the substrate.
 4. The colorconversion panel of claim 2, further comprising an inner light filterlayer provided between the reflection layer and at least one of thefirst color conversion layer or the second color conversion layer. 5.The color conversion panel of claim 1, further comprising a light filterlayer provided between the planarization layer and the first colorconversion layer, and between the planarization layer and the secondcolor conversion layer.